Minor updates.

src/types.ts

@@ -1,6 +1,11 @@
-
+/**
+ * Error code type
+ */
 export type ErrorCodeType = string | number;
 
 export type ErrorOptions = {
-  code?: ErrorCodeType
-}
+  /**
+   * Error code
+   */
+  code?: ErrorCodeType;
+};

src/util.ts

@@ -1,45 +1,4 @@
-/**
- * Utility functions
- */
-
-import { ErrorCodeType, ErrorParameters } from './error_base';
-
-/**
- * Get either default or predefined error message
- * @param code Error code or message (e.g. E_NOT_FOUND)
- * @param config Configuration object
- */
-export const getEitherDefaultOrPredefinedErrorMessage = (
-  opts: ErrorParameters,
-): string => {
-  // set default error message
-  let errorMessage = getDefaultErrorMessage(opts.code);
-
-  // error message is inherited from the error message
-  if (config && config.error) {
-    errorMessage = config.error.message;
-  }
-
-  // error message is overwritten by the user
-  if (config && config.message) {
-    errorMessage = config.message;
-  }
-
-  return errorMessage;
-};
-
-export const isNull = (inp: any) => inp === null;
-export const isUndefined = (inp: any) => typeof inp === 'undefined';
-export const isNullOrUndefined = (inp: any) => isNull(inp) || isUndefined(inp);
-
 export const isString = (inp: any) => typeof inp === 'string';
+
 export const isNonEmptyString = (inp: any) =>
   isString(inp) === true && inp.length > 0;
-
-export const getErrorMessage = (
-  message: string | undefined,
-  code: ErrorCodeType,
-) =>
-  isNonEmptyString(message) === true
-    ? message!
-    : `Error '${code}' was occurred.`;